Abstract
The oxidation of ultra-thin lead overlayers on polycrystalline silver surfaces has been studied by X-ray and UV photoelectron spectroscopy. Oxygen is found to react with the lead overlayers to form an oxide species with a chemical shift of 0.8 eV for both 4f and 5d levels for all lead coverages in the range 0.05–2 monolayers. This is identified as a lead monoxide species by comparison with results from the oxidation of bulk lead surfaces. A striking feature is the sharp rise in oxygen sticking coefficient with lead coverage to a maximum at θ Pb=0.5 and eventual fall to a low value at θ Pb=1 and above. The oxidation rates of the lead overlayers indicate two different oxidation regimes: for θ Pb < 0.5 the oxidation rate is relatively high and approximately independent of lead coverage; for θ Pb > 0.5 the oxidation rates of the overlayers fall rapidly reaching a constant low value at monolayer completion. This behaviour is discussed in relation to probable changes in lead overlayer structure.
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